management of chronic kidney disease and its complications · 2019-05-15 · management of chronic...
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Management of Chronic Kidney Disease and its Complications
Sankar Dass Navaneethan, M.D., MS, MPH, FASNSection of Nephrology
Baylor College of Medicine
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Objectives
• Review timing of CKD related complications and referral to specialists for CKD care
• Understand the management of anemia and hyperkalemia in those with CKD
• Review management of various aspects of secondary hyperparathyroidism in CKD
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Albuminuria• Random urine albumin:creatinine ratio (UACR) is
recommended for all CKD patients
• Early morning sample is better
• Normal UACR - <10 mg/g
• Term microalbuminuria is not recommended (30-300 mg/g) by both ADA and nephrology guidelines
• 24 hour urinary protein excretion is cumbersome and unreliable
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CKD Prognosis Consortium. Lancet 2010; 375: 2073–81
Lower eGFR and higher levels of albuminuria increases the risk of
cardiovascular death
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Higher Cardiovascular Disease Burden in Those with CKD
Source: United States Renal Data System
December 31, 2010 point prevalent Medicare enrollees
CKD
CVA/TIA 26.0%
CHF43.6%
AMI12.5%
No CKD
CHF19.1%
AMI5.8%
CVA/TIA 20.3%
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KDIGO CKD Classification
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When to refer to Nephrology?
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Complications of CKD• Hypertension• Hyperlipidemia• Anemia• CKD- Mineral and bone disorder: Hyperphosphatemia,
vitamin D deficiency• Metabolic acidosis• Hyperkalemia• Vascular access referral
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Recent Hypertension Guidelines for CKD
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CKD + HTN: Target BP = 130/80 mm Hg
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How do we manage hypertension in CKD
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ACEI & ARBs• ACEI lowered kidney disease progression, CV events and
mortality in CKD
• ARB exerts renal and CV benefits but mortality benefits are unknown
• Combination therapy with ACEI and ARB is not justified
• Despite data supporting RAASI use in CKD, >40% of the CKD population is not on these much-deserved medications
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Agents to treat hypertension in CKD
• ACEI or ARB• Diuretics (loop preferred in those with GFR <30)• Calcium channel blockers• Beta-blockers• Vaso-dilators- Hydralazine or Nitrates or Minoxidil• Alpha blockers- clonidine• Resistant HTN: BP >140/90 mm Hg despite using three
agents including a diuretic
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Carey et al. AHA Scientific Statement on Resistant Hypertension. Hypertension 2018
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Guidelines recommendations for lipid lowering therapy – statins for all CKD patients
• In adults aged >50 years with eGFR <60 ml/min/1.73 m2 but not treated with chronic dialysis or kidney transplantation (GFR categories G3a-G5), we recommend treatment with a statin or statin/ezetimibe combination (1A)
• In adults aged >50 years with CKD and eGFR >60 ml/min/1.73m2 (GFR categories G1-G2) we recommend treatment with a statin (1B)
Tonelli M et al. Ann Intern Med. 2014 Feb 4;160(3):182
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Recommended statin dose in CKD population
Statin CKD Patients*
Lovastatin NDFluvastatin 80Atorvastatin 20Rosuvastatin 10
Simvastatin/ezetimibe 20/10Pravastatin 40Simvastatin 40Pitavastatin 2
* Includes CKD patients with eGFR G3a-G5, Receiving Dialysis or Who Had a Kidney Transplant
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Anemia in CKD
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Fishbane et al. AJKD 2018
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Work-up of anemia in CKD
• Complete blood count (CBC), which should include Hb concentration, red cell indices, white blood cell count differential, and platelet count
• Absolute reticulocyte count
• Serum ferritin level
• Serum transferrin saturation (TSAT)
• Serum vitamin B12 and folate levels
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Don’t raise the hemoglobin to normal levels in kidney disease
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Iron therapy• For people who are not receiving hemodialysis, consider
a trial of oral iron before offering intravenous iron therapy.
• If they are intolerant of oral iron or target hemoglobin levels are not reached within three months, offer intravenous iron therapy
• Offer iron therapy to people with anemia of CKD who are iron deficient and who are receiving ESA therapy
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Erythropoiesis-stimulating agents
• CKD patients who have a hemoglobin <10 g/dL whose iron stores are replete
• Subcutaneous administration – better
• Benefits: Reducing transfusion needs and anemia related symptoms
• Adverse effects: Worsening of hypertension, stroke, clotting of fistula
• Caution in those with active malignancy
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Hyperkalemia with ACEI ARB use• Assess renal function to define overall risk of hyperkalemia
• Start with low doses and monitor closely
• Discontinue medications that can impair renal potassium excretion, including herbal preparations and over the-counter NSAIDS
• Reduce potassium in diet, avoid salt substitutes containing potassium
• Ensure effective diuretic therapy (loop diuretics should be used if the estimated glomerular filtration rate is < 30 mL/min/1.73 m2 )
• Correct metabolic acidosis when present
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Initiation of low dose ACEI/ARB
-No hyperkalemia-No AKI
Check basic metabolic panel in 1-2 weeks
Home BP monitoring/Office visit in 4
weeks
• Symptomatic hypotension
• SBP <100 mmHg
• Discontinue ACEI/ARB
-No hyperkalemia-AKI
-Mild hyperkalemia -No AKI
-Moderate to severe hyperkalemia -No AKI
-Mild hyperkalemia -AKI
-Moderate to severe hyperkalemia-AKI
Continue to titrate dose based on BP
Recheck BMP in 2 weeks
STEP 1
STEP 2
Reassess diet, diuretics and metabolic acidosis
Follow STEP 2
-Stop ACEI/ARB- Consult Nephrology
• Mild hyperkalemia: potassium levels 5.0-5.5 mEq/L• Moderate to severe hyperkalemia: potassium levels >5.5 mEq/L• Acute Kidney Injury (AKI): >30% rise in serum creatinine)
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Management of chronic hyperkalemia• Low potassium diet and diuretics• Novel agents- Patiromer and ZS-9
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CKD-Mineral and Bone Disorder
A systemic disorder of mineral and bone metabolism due to CKD manifested by either one or a combination of the following:
• Abnormalities of calcium, phosphorus, PTH, or vitamin D metabolism
• Abnormalities in bone turnover, mineralization, volume, linear growth, or strength
• Vascular or other soft tissue calcification
Moe S, et al. Kidney Int 69: 1945, 2006
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When and what to test?
Suggested frequencies of serum calcium, phosphorus, and PTH measurements according to CKD stage
Progressive CKD stage 3
CKD stage 4 CKD stage 5
Calcium and phosphorus 6 – 12 months 3 – 6 months 1 -3 months
PTH and alkaline phosphatases
Baseline 6 – 12 months 3 – 6 months
KDIGO CKD-MBD guidelines. Kidney Int. 76; 2009
Recommended target: Calcium and phosphorus within normal range reported in your laboratory
PTH: 2-9 times the upper limit of the assay used to measure PTH
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How to correct Abnormal PTH Levels
• Correct hyperphosphatemia
• Replete nutritional vitamin D deficiency
• Vitamin D analogue initiation
• Cinacalcet in dialysis patients
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Binder type Advantages Disadvantages
Aluminum salts (RARELY USED) Highly effective, inexpensive Proven toxicity, requires monitoring
Calcium carbonate and acetate(widely prescribed)
Moderately effective, inexpensive Hypercalcemia and possible vascular calcification
Magnesium salts Moderately effective, free of calcium and aluminum, fairly inexpensive
Gastrointestinal effects, requires monitoring
Lanthanum carbonate Highly effective, low pill burden Expensive, gastrointestinal effects
Sevelamer hydrochloride and sevelamer carbonate (widely used)
Moderately effective, lipid effects Expensive, high pill burden, gastrointestinal effects
Iron based binders(Ferric citrate, Sucroferricoxyhydroxide)
Lower iron requirement along with phosphate binding, lower pill burden
Lack of clinical experience
Phosphate Binders Currently Available for Clinical Use
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Serum 25 (OH)D(ng/ML) Definition
Ergocalciferol Dose(Vitamin D2)
Duration(months) Comment
<5
Severe vitamin D deficiency
50,000 IU/wk orally x 12 wks; then monthly
6 months Measure 25 (OH) D levels after 6 months
500,000 IU as single I.M. dose
Assure patient adherence; measure 25(OH)D at 6 months
5-15 Mild vitamin D deficiency 50,000 IU/wk x 4 weeks, then 50,000 IU/month orally
6 months Measure 25(OH)D levels after 6months
16-30 Vitamin D insufficiency 50,000 IU/month orally 6 months
How to Treat Vitamin D Deficiency
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Vitamin D Analogues in CKD
• Agents: Calcitriol, Doxercalciferol, Paricalcitol
• Lowers PTH levels
• Hypercalcemia risk
• Large observational study showed survival benefit with newer vitamin D analogues such as Paricalcitol in dialysis
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Types of bone disease in CKD
• Osteitis fibrosa : High turnover state
• Adynamic bone disease: Low turn over disease
• Osteomalacia: Bone formation rate is low
• Mixed uremic osteodystrophy
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Osteoporosis Medications
• CKD stages 1–2 with osteoporosis and/or high risk of fracture, we recommend management as for the general population (1A).
• CKD stage 3 with PTH in the normal range and osteoporosis and/or high risk of fracture, we suggest treatment as for the general population (2B).
• CKD stages 4–5D having biochemical abnormalities of CKD–MBD, and low BMD and/or fragility fractures, we suggest additional investigation with bone biopsy prior to therapy with antiresorptive agents (2C).
KDIGO CKD-MBD guidelines. Kidney Int. 76; 2009
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Metabolic acidosis• Metabolic acidosis is associated with cardiovascular
disease, kidney disease progression and death in CKD
• KDIGO guidelines: We suggest that in people with CKD and serum bicarbonate concentrations <22 mmol/l treatment with oral bicarbonate supplementation be given to maintain serum bicarbonate within the normal range, unless contraindicated. (2B)
• Sodium bicarbonate 650 meq PO three-four times daily-safe and effective. Most studies used sodium bicarbonate rather than Bicitra
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Protein and salt intake – Guideline recommendations • We suggest lowering protein intake to 0.8 g/kg/day in
adults with diabetes (2C) or without diabetes (2B) and GFR <30 ml/min/ 1.73 m2 (GFR categories G4-G5), with appropriate education.
• We suggest avoiding high protein intake (41.3 g/kg/day) in adults with CKD at risk of progression. (2C)
• We recommend lowering salt intake to <90 mmol (<2 g) per day of sodium (corresponding to 5 g of sodium chloride) in adults, unless contraindicated. (1C)
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WEIGHT LOSS – DIETARY OPTIONS
• CKD: A reduction in daily caloric intake by 500 kcal
• Balanced reduction in calorie intake
• Close monitoring for weight loss – avoid malnutrition and preserve muscle mass
• Intensive caloric restriction (<1200 kcal/day) might be avoided
• Counsel to watch-out for high-protein diets
Kramer et al. Am J Kidney Dis. 2009; 53: 151-165Navaneethan SD et al. CJASN 2009
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Glycemic targets in CKD
• Imprecision of HbA1c with CKD
• HbA1c 7-8% to prevent or delay progression of the microvascular complications of diabetes, including DKD
• Do not target HbA1c <7% in those at risk for hypoglycemia
KDOQI Guidelines: Am J Kidney Dis. 2012;60(5):850-886; Navaneethan SD et al. AJKD 2017
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PILL BURDEN IN CKD
Chiu YW. Clin J Am Soc Nephrol 2009;4:1089-96
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Kidneyfailurerisk.com
The kidney failure risk equations were developed in patients with CKD stages G3-G5 referred to nephrologists in Canada, and have now been validated in
more than 700,000 individuals spanning 30 + countries worldwide.
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Referral for vascular access• CKD education• Vascular access referral
“We recommend timely referral for planning renal replacement therapy in people with progressive CKD in whom the risk of kidney failure within 1 year is 10–20% or higher, as determined by validated risk prediction tools. (1B)”
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Conservative kidney care• Conservative management should be an option in people
who choose not to pursue RRT and this should be supported by a comprehensive management program
• Loop diuretics and other medications can be continued
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Conclusions• Statins are indicated for all CKD patients
• BP Target: 130/80 mm Hg and ACEI or ARB first choice
• Don’t target Hb >10-11 g/dl in those with kidney disease
• Metabolic acidosis and hyperphosphatemia should be corrected to improve outcomes
• Refer all CKD patients with EGFR <30 and those with rapid decline in EGFR (>3 ml/min/year)
• Protein intake not to exceed 0.8 g/kg/day depending on their stage of kidney disease
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